Shuttle machine for machine tool

ABSTRACT

A shuttle machine for transporting work pieces for a sealing press or other machine tool is disclosed. It has two conveyers for transporting work pieces. The two conveyers are supported by a frame to move back and forth in opposite directions. When the two conveyers are in a first position, a second section of the first conveyer and a first section of the second conveyer are located near the tool, while the first second of the first conveyer and the second section of the section conveyer are accessible to first and second operators, respectively. Both operators can unload and reload work pieces simultaneously while the tool operates on the already loaded work pieces. When the conveyers are moved to a second position, the sections previously operated on are accessible for unloading and reloading, and the sections just loaded are operated on. A related operating method is also disclosed.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a shuttle machine used in a sealing press orother machine tools for transporting work pieces.

2. Description of the Related Art

FIGS. 1A-1C illustrate a conventional shuttle machine used in a sealingpress for sealing product packages, such as blister-pack packages. Theshuttle machine is also used in other types of machines for punching,gluing, embossing, stamping, etc. As shown in FIG. 1B, the sealingmachine includes a press 12 having an upper platen 12 a and a lowerplaten 12 b, a support frame 14 situated between the two platens, and asealing die 16 resting on the support frame 14. The sealing die 16 has anumber of openings 16 a into which the packages to be sealed are placed.The die 16 has two sections 16-1 and 16-2 substantially identical insize and shape, each section including one or more openings 16 a. Asshown in FIGS. 1B and 1C, the sealing die 16 can slide or move alongguide rails 14 a on the support frame 14 so that the two sections 16-1and 16-2 are alternately located under the press 12.

In operation, two operators are located to the left and right of thesealing press, respectively. Note that terms such as “left” and “right”as used in this disclosure are with respect to the drawings. In anactual press or other machine tool, the operators may be located in thefront and back of the machine (for example, the right hand side of FIG.1B may be the front of the machine), or on the left and right sides ofthe machine. When the die 16 is moved to the right of the support frameas shown in FIG. 1B, the left-hand section 16-1 is located under thepress and the right-hand section 16-2 is exposed and accessible to thesecond operator who is locate to the right of the sealing press. Thesecond operator unloads packages that have been sealed and loadsunsealed packages into the openings 16 a in the right-hand section 16-2of the die. Simultaneously, the press 12 operates to seal the packagesthat have been loaded into the left-hand section 16-1 of the die. Whenboth the pressing and the unloading and reloading by the second operatorare finished, the die is moved to the left (e.g. by a drive mechanismand initiated by one of the operators) into the position shown in FIG.1C. At this position, the right-hand section 16-2 of the die is locatedunder the press 12 and the left-hand section 16-1 is accessible. Thefirst operator, located to the left of the sealing press, unloads thepackages that have just been sealed and load unsealed packages into theleft-hand section 16-1 of the die. Simultaneously, the press 12 operatesto seal the packages that have just been loaded into the right-handsection 16-2 of the die. When both the pressing and the unloading andreloading by the first operator are finished, the die is moved to theright into the position shown in FIG. 1B.

SUMMARY OF THE INVENTION

Using the conventional shuttle machine described above,unloading/loading of one section of the die can occur simultaneously asthe pressing of the other section of the die by the press, improvingefficiency and throughput. However, it still contains inefficiency inthat one of the operators has to wait when the other operator isunloading and reloading one section of the die and the press is pressingthe other section.

An object of the present invention is to provide a shuttle machine thatovercomes this inefficiency.

Additional features and advantages of the invention will be set forth inthe descriptions that follow and in part will be apparent from thedescription, or may be learned by practice of the invention. Theobjectives and other advantages of the invention will be realized andattained by the structure particularly pointed out in the writtendescription and claims thereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purposeof the present invention, as embodied and broadly described, the presentinvention provides a shuttle machine for transporting a plurality ofwork pieces in a machine tool, the machine tool including a tool foroperating on work pieces, the shuttle machine including: a supportframe; and first and second conveyers moveably supported by the supportframe for transporting work pieces, wherein each conveyer includes afirst and a second section, each section being adapted for holding oneor more work pieces, wherein the first and second conveyers are moveablein opposite directions between a first state and a second state, whereinin the first state, the second section of the first conveyer and thefirst section of the second conveyer are disposed adjacent the tool, thefirst section of the first conveyer is exposed and accessible to a firstoperator, and the second section of the second conveyer is exposed andaccessible to a second operator, and wherein in the second state, thefirst section of the first conveyer and the second section of the secondconveyer are disposed adjacent the tool, the first section of the secondconveyer is exposed and accessible to a first operator, and the secondsection of the first conveyer is exposed and accessible to a secondoperator.

In another aspect, the present invention provides a method for operatingthe above shuttle machine, including the following steps: (a) moving thefirst and second conveyers to the first state; (b) unloading andreloading the first section of the first conveyer and the second sectionof the second conveyer while the first and second conveyers are in thefirst state; (c) initiate working on work pieces loaded into the secondsection of the first conveyer and the first section of the secondconveyer while the first and second conveyers are in the first state;(d) moving the first and second conveyers to the second state; (e)unloading and reloading the first section of the second conveyer and thesecond section of the first conveyer while the first and secondconveyers are in the second state; (f) initiate working on work piecesloaded into the first section of the first conveyer and the secondsection of the second conveyer while the first and second conveyers arein the second state; and (g) repeating steps (a) to (f).

It is to be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory and areintended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A-1C illustrate a conventional shuttle machine.

FIGS. 2A-2C illustrate a shuttle machine according to an embodiment ofthe present invention.

FIG. 3 illustrates a shuttle machine according to another embodiment ofthe present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A shuttle machine according to an embodiment of the present invention isdescribed with reference to FIGS. 2A-2C. The shuttle machine may be usedin a sealing machine or other types of machine tools for punching,gluing, embossing, stamping, etc. A sealing press for sealing productpackages, such as blister-pack packages is used as an example in thefollowing descriptions.

As shown in FIG. 2B, the sealing machine includes a press 12 having anupper platen 12 a and a lower platen 12 b, a support frame 24 situatedbetween the two platens, and two sealing dies 26 and 27 resting on thesupport frame 24. Each sealing die 26, 27 has a number of openings 26 a,27 a into which the packages to be sealed are placed. Each die 26, 27has two sections 26-1 and 26-2, 27-1 and 27-2, which are substantiallyidentical in size and shape. Each die section includes one or moreopenings 26 a, 27 a. As shown in FIGS. 2B and 2C, the sealing dies 26and 27 can move along guide rails 24 a, 24 b on the support frame 24. Inthe illustrated embodiment, the guide rails 24 a, 24 b are located onthe top surface of the support frame 24 and engages corresponding wheelsor grooves on the bottom of the dies 26, 27. Alternatively, the guiderails may be located on the sidewalls of the support frame. Othersuitable structures may also be used to support the dies 26, 27 to moveon the support frame 24. In addition, the support frame may have adifferent structure than that shown in FIGS. 2B and 2C. For example, thesupport frame may be designed so that the dies are attached to thesupport frame on their sides rather than resting on top of the supportframe.

A drive mechanism (not shown) drives the dies 26, 27 to move back andforth in opposite directions between two states. In the first state,shown in FIG. 2B, the right-hand section 26-2 of the first die 26 andthe left-hand section 27-1 of the second die 27 are located under thepress 12. (Note that terms such as “left” and “right” as used in thisdisclosure are with respect to the drawings. In an actual press or othermachine tool, the operators may be located in the front and back of themachine (for example, the right hand side of FIG. 2B may be the front ofthe machine), or on the left and right sides of the machine.) Theleft-hand section 26-1 of the first die 26 is exposed and accessible toa first operator who is located to the left of the sealing press, andthe right-hand section 27-2 of the second die 27 is exposed andaccessible to a second operator who is located to the right of thesealing press. In the second state, shown in FIG. 2C, the left-handsection 26-1 of the first die 26 and the right-hand section 27-2 of thesecond die 27 are located under the press 12. The right-hand section26-2 of the first die 26 is exposed and accessible to the secondoperator located to the right of the sealing press, and the left-handsection 27-1 of the second die 27 is exposed and accessible to the firstoperator located to the left of the sealing press.

In operation, when the dies 26 and 27 are moved to the first state, asshown in FIG. 2B, the first operator unloads packages that have beensealed and loads unsealed packages into the openings 26 a in theleft-hand section 26-1 of the first die 26. Simultaneously, the secondoperator unloads packages that have been sealed and loads unsealedpackages into the openings 27 a in the right-hand section 27-2 of thesecond die 27. Also simultaneously, the press 12 operates to seal thepackages that have been loaded into the right-hand section 26-2 of thefirst die 26 and the left-hand section 27-1 of the second die 27. Whenboth the pressing and the unloading and reloading by the first andsecond operators are finished, the dies 26, 27 are moved to the secondstate, as shown in FIG. 2C.

Preferably, the drive mechanism drives both dies to move simultaneously,and the moving may be initiated by either one of the operators.Alternatively, the drive mechanism drives the two dies separately, andthe moving of the respective die is initiated by the operator who loadedthat die.

When the dies are in the second state as shown in FIG. 2C, the firstoperator unloads packages that have been sealed and loads unsealedpackages into the openings 27 a in the left-hand section 27-1 of thesecond die 27. Simultaneously, the second operator unloads packages thathave been sealed and loads unsealed packages into the openings 26 a inthe right-hand section 26-2 of the first die 26. Also simultaneously,the press 12 operates to seal the packages that have been loaded intothe left-hand section 26-1 of the first die 26 and the right-handsection 27-2 of the second die 27.

In an alternative embodiment, instead of the dies 26, 27, two flatcarriers are disposed on top of the support frame 24. The carriers aresupported to move along guide rails or other structures of the supportframe 24 in a similar fashion as the dies 26 and 27 move as shown inFIGS. 2B and 2C. The carriers are tray-shaped and two dies are carriedby the two carriers, respectively. Using carriers is advantage becausethe dies typically need to be changed frequently. The dies are tooled tohave specific shapes for specific products to be sealed. By using thecarriers, the dies can be easier changed by taking old dies out of thecarriers and placing new dies into the carriers.

FIG. 3 is a top view illustrating a shuttle machine having two carriersaccording to an alternative embodiment of the present invention. The twocarriers 38 and 39 are supported to move in the left-right directionalong guide rails or other support structures of a support frame (notshown). The side of each carrier 38, 39 facing the other carrier isprovided with a rack 38 a, 39 a, and one or more pinions 40 are providedbetween and engaging the two racks so that the two carriers move inopposite directions in a synchronized manner. The dashed lines in FIG. 3indicate the position of the press 12. Of course, those skilled in themechanical art will recognize that the two carriers may be implementedin many other ways.

An advantage of the shuttle machine described above is that neitheroperator has to wait when the other operator is loading the other sideof the die as in the conventional shuttle machine. The two operatorswork simultaneously to unload and reload their respective section of thedies. This reduces wait time and increases efficiency.

Although a sealing press is used in the above description as an example,the shuttle machine may be used on any machine tools to transport workpieces to be processed. Depending on the type of machine tool, the toolthat operates on the work pieces may be a press or other suitable tools.Similarly, the dies may be replaced by other suitable types of holdersthat hold the work pieces.

More generally, the shuttle machine according to embodiments of thepresent invention includes two moving conveyers for conveying aplurality of work pieces, where the two moving conveyers move inopposite directions. In the embodiment of FIGS. 2A-2C, each conveyer isa die. In the embodiment of FIG. 3, each conveyer includes a carrier anda die carried thereon. In other embodiments, other suitable types ofholders in lieu of a die may be used to hold the work piece depending onthe nature of the work piece and the tool that operate on them.

Any suitable drive mechanism may be used to drive the opposite motion ofthe two conveyers and its implementation is well within the abilities ofthose skilled in the mechanical art. The drive mechanism is preferablymachine powered (electrical, hydraulic, pneumatic, a combination ofthem, etc.), but it can also be human powered. Further, the shuttlemachine may also be constructed so that the two conveyers move (slide)on the support frame under human power without a drive mechanism.

Although in the above descriptions the operators performing the loadingand unloading tasks are human operators, the term “operator” in thisdisclosure may also refer to mechanical devices such as robotic armsthat perform the loading and unloading tasks.

Although a two-conveyer implementation is sufficient to reduce wait timeand improve efficiency, the shuttle machine may include more conveyers,such as four, etc.

It will be apparent to those skilled in the art that variousmodification and variations can be made in the shuttle machine of thepresent invention without departing from the spirit or scope of theinvention. Thus, it is intended that the present invention covermodifications and variations that come within the scope of the appendedclaims and their equivalents.

1. A sealing press shuttle machine for transporting a plurality of diemembers comprising: an upper platen and a lower platen in alignmentalong a vertical axis; a support frame defining a horizontal conveyingaxis intersecting the vertical axis; a first die member and a second diemember slidably supported on the support frame, each die member having afirst section and a second section; wherein the first and second diemembers are movable on the support frame in opposite directions alongthe support frame between a first state and a second state, wherein inthe first state, the second section of the first die member and thefirst section of the second die member are between the upper and lowerplatens in vertical alignment therewith, and wherein in the secondstate, the first section of the first die member and the second sectionof the second die member are between the upper and lower platens invertical alignment therewith and wherein each die member has a rack on aside facing the other die member, the sealing press shuttle machinefurther including one or more pinions disposed between and engaging theracks of the first and second die members.
 2. The machine of claim 1,further comprising a drive mechanism for driving the first and seconddie members in opposite directions between the first state and thesecond state.
 3. The machine of claim 1, wherein each die member is awork piece holder for holding work pieces.
 4. The machine of claim 3,wherein each die member has a plurality of openings for receiving workpieces.
 5. The machine of claim 1, wherein the first and second diemembers are simultaneously moveable in opposite directions between afirst state and a second state.
 6. A method for operating a sealingpress shuttle machine to transport a plurality of die members, whereinthe machine includes an upper platen and a lower platen in alignmentalong a vertical axis, a support frame defining a horizontal conveyingaxis intersecting the vertical axis, a first die member and a second diemember slidably supported on the support frame, each die member having afirst section and a second section, wherein the first and second diemembers are movable on the support frame in opposite directions alongthe support frame between a first state and a second state, wherein inthe first state, the second section of the first die member and thefirst section of the second die member are between the upper and lowerplatens in vertical alignment therewith, and wherein in the secondstate, the first section of the first die member and the second sectionof the second die member are between the upper and lower platens invertical alignment therewith, the method comprising: (a) moving thefirst and second die members to the first state; (b) unloading andreloading the first section of the first die member and the secondsection of the second die member while the first and second die membersare in the first state; (c) initiate at least the upper platen to sealwork pieces loaded into the second section of the first die member andthe first section of the second die member while the first and seconddie members are in the first state; (d) moving the first and second diemembers to the second state; (e) unloading and reloading the firstsection of the second die member and the second section of the first diemember while the first and second die members are in the second state;(f) initiate at least the upper platen to seal work pieces loaded intothe first section of the first die member and the second section of thesecond die member while the first and second die members are in thesecond state; and (g) repeating (a) to (f).
 7. The method of claim 6,wherein steps (b) and (c) are performed simultaneously and steps (e) and(f) are performed simultaneously.